package com.wugui.datax.admin.core.route.strategy;

import com.wugui.datatx.core.biz.model.ReturnT;
import com.wugui.datatx.core.biz.model.TriggerParam;
import com.wugui.datax.admin.core.route.ExecutorRouter;

import java.util.List;
import java.util.Random;
import java.util.concurrent.ConcurrentHashMap;
import java.util.concurrent.ConcurrentMap;

/** Created by xuxueli on 17/3/10. */
public class ExecutorRouteRound extends ExecutorRouter {

  private static ConcurrentMap<Integer, Integer> routeCountEachJob =
      new ConcurrentHashMap<Integer, Integer>();
  private static long CACHE_VALID_TIME = 0;

  private static int count(int jobId) {
    // cache clear
    if (System.currentTimeMillis() > CACHE_VALID_TIME) {
      routeCountEachJob.clear();
      CACHE_VALID_TIME = System.currentTimeMillis() + 1000 * 60 * 60 * 24;
    }

    // count++
    Integer count = routeCountEachJob.get(jobId);
    count =
        (count == null || count > 1000000)
            ? (new Random().nextInt(100))
            : ++count; // 初始化时主动Random一次，缓解首次压力
    routeCountEachJob.put(jobId, count);
    return count;
  }

  @Override
  public ReturnT<String> route(TriggerParam triggerParam, List<String> addressList) {
    String address = addressList.get(count(triggerParam.getJobId()) % addressList.size());
    return new ReturnT<String>(address);
  }
}
